Shuttle-operating mechanism for sewing-machines



(No Model.)

3 Sheets-Sheet 1. J. E. BERTRAND.

SHUTTLE OPERATING MEGHANISM FOR SEWING MACHINES. No. 421,808. PatentedFeb. 18, 1890.

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{No.ModelJ a Sheets-Sheet 2. J. E. BERTRAND.

SHUTTLE OPERATING MECHANISM FOR SEWING MACHINES.

No. 421,808. Patented Feb. 18. 1890.

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Wibwsses: Invenlor: I JosephEliBerlrand,

u PETERS. Pbmo-Ulhognyhov. wnm m n a NITED STATES PATENT FFIcE.

JOSEPH ELI BERTRAND, OF BOSTON, ASSIGNOR OF ONE-HALF TO MELLEN BRAY, OFNEVTON, MASSACHUSETTS.

SHUTTLE-OPERATING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 421,808, dated February18, 1890.

llpplication filed July 29, 1889. Serial No. 319,014. (No model.)

To aZZ whom it may concerni I. I

Be it known that I, JOSEPH ELI BERTRAND, of Boston, in the county ofSuffolk and State of Massachusetts, have invented a new and usefulImprovement in Sewing-Machine Shuttle-Operating Mechanisms, of which thefol lowing, taken in connection with the accomE- panying drawings, is aspecification. j

My invention relates to sewing-machine shuttle-operating mechanisms; andit consists of certain novel features of construction, arrangement, andcombination of parts, which will be readily understood by reference tothe description of the drawings and to the claims, to be hereinaftergiven, and in which my invention will be clearly pointed out.

Figure 1 of the drawings is an inverted plan of the bed of the machinewith the shuttleoperating shaft and portions of mechanism for operatingthe same and illustrating my invention. Fig. 2 is a vertical section online :0 as on Fig. 1. Fig. 3 is a partial section on line 3 g} on Fig.2, looking toward the front of the machine. Fig. at is a partialvertical section on line a z on Fig. 2, looking toward the rear of themachine. Fig. 5 is a partial section 011 line 1; c on Fig. 1, lookingtoward the center of the machine; and Fig. 6 is a front end view of theshuttle-driver.

This invention covering the shuttle-operating mechanism forms a part ofthe machine shown and described in another application of mine of evendate herewith, and is shown and partially described ptherein, but notclaimed, and hence only so much of the machine is shown in the drawingsand described in the specification of this case as may be necessary tothe clear understanding of the shuttle-operating mechanism.

In the drawings, A is the bed of the machine,to be supported upon asuitable column. (Not shown.)

B is one of the side frames.

0 is the cam-shaft, and D is the front T- girt.

E is the shuttle, of the revolving hook pattern, having formed therein achamber to receive the bobbin a in a well-known manner. This shuttle hasformed upon its periphery a lip b, which fits into a correspondinggroove in the shuttle-holder or race F, secured to the front of the bedA in a fixed position.

G- is the shuttle-operating shaft, mounted in a bearing in theshuttle-holder or race F and another bearing in the stand F, and has '55firmly secured upon its front end the sleeve f, upon the front end ofwhich is formed the curved wing f, which engages with the shuttleinadvance of its hook to impart the motion of the shaft G to theshuttle.

The object of this invention is to impart to the shuttle an intermittentrotary motion always in the same directionthat is, give to the shuttle acomplete revolution for each stitch, with a standstill between each tworevolutions of sufficient length for the needle and awl to be movedupward through the work, feed the work, receive the thread in the barbof the needle, draw the loop of thread through the work, and be moved totheir rearmost positions to form the loop below the work through whichthe shuttle is to pass. To accomplish this, I form upon the rear end ofthe shaft G two crank-pins c and cl, arranged nearly quartering to eachother, as indicated in Figs. 3 and at. The crank-pin c is connected bythe link 0 to the longer arm of the elbow-lever 0 the shorter arm ofwhich is pivoted to the lower end of the verticallysliding bar 0 fittedto abearing in the stand So I and carrying at its upper end an anti-triotion roll, which fits into and is acted upon by the path of the cam H,as shown in dotted lines in Fig. 5 and in full lines in Fig. 4. Thecrank-pin d is,in like manner con nected by the link (1 to the longerarm of the elbow-lever (K the shorter arm of which is pivoted to thelower end of the verticallysliding bar (1 also fitted to a bearing inthe stand I and carrying at its upper end an anti- 9o friction rollwhich fits into and is acted upon by the path of the cam I-I. (See Figs.2 and 4.) The bars 0 and d are mounted in the same stand I, side by sidewith their inner faces in contact, and are guided in their verticalmovements by the lips c and d respectively, which fit into verticalgrooves in the stand I, as shown.

The paths of the cams H and H (shown in dotted lines in Figs. 2 and 5,respectively) are I made of such shape that the path of one cam shallnot serve as a resistance to the operation of the othercam and with thetwo crankpins set nearly quartering to each other and the axis of theirshaft, one or the other of the cams is always acting to advantage uponthe shaft G to rotate it, thus avoiding completely any trouble fromdead-centers, and a complete revolution of the revolving shuttle orloopinghook is obtained in about one quarter of a revolution of thecam-shaft, and then the shuttle or hook remains in a state of restduring the remainder of the revolution of said camshaft, and then hasanother complete revolution in the same direction imparted thereto withanother corresponding standstill succeeding it. This is a very importantfeature of my invention, as the shuttle or hook has no retrograde orbackward movement given to it, but is always moved in the same directionbut with an intermittent motion, it remaining in a state of rest aftereach complete revolution a sufficient length of time for the needle andawl to ad Vance from their most rearward positions, pierce the materialto be sewed, receive the thread above the work, and recede to itsrearmost position to form and spread the loop below the work for thepassage of said shuttle or hook. I

H is the needle-operating shaft, having firmly secured thereon thepinion c and the needle and awl carrying radius-arm d, in the end ofwhich is set the needle f and awl and loosely mounted thereon the needleand awl guide and stay It, all of which, as they form no part of thepresent invention, will not be further described here.

The subject-matter of this specification is shown and described but notclaimed in an application of even date herewith, and filed July 29,1889, Serial No. 319,015.

\Vhat I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. In a sewing-machine, the combination of arevoluble bobbin-carryingshuttle, a shaft for driving said shuttle, provided with two cranks setat right angles, or nearly so, to each other, two path-cams, a system ofrods and lever connecting one of said cams with one of said cranks,and asimilar system of rods and lever connecting the other of said cams withthe other crank, whereby said shuttle may be intermittently revolvedalways in the same direction without loss of power on account ofdead-points.

In a sewing-machine, the combination of the shuttle or hook E, thedriver f, the shaft G, having two crank-pins c and (Z, the links 0' andd, the lovers 0 and (Z the sliding bars c and (I and the cams II and H.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 22d day of July, A. D.1889.

JOSEPH EIII BER'IRAND.

Witnesses:

N. C. LoMBAnD, WALTER E. LoMnARD.

